Initial heat supply network station for waste heat utilization of coal-fired power plant

Abstract

The invention discloses an initial heat supply network station for waste heat utilization of a coal-fired power plant. The initial heat supply network station comprises a condenser and a heat supply network station body. The condenser adopts exhausted steam of a high-back-pressure steam turbine to heat circulating water. The heat supply network station body is mainly composed of heat supply network circulation water pumps, an exhausted steam cooler and a heat supply network heater. The exhausted steam cooler, the heat supply network heater and the condenser operate in series. Three of the heat supply network circulation water pumps are circulation water pumps driven by a back-pressure steam turbine and used for operating, and the other one is an electrically driven circulation water pump and used for standby. The heat supply network heater is a horizontal U-shaped pipe heater. The heat supply network heater and the exhausted steam cooler both adopt the high-back-pressure steam turbine for steam pumping and heating. The heating capacity is achieved through combination of the steam turbine high-back-pressure exhausted steam waste heat recycling technology and a conventional heat supply network, the energy utilization efficiency is greatly improved, and the initial heat supply network station meets the national policy about energy conservation and emission reduction and has a significant demonstration effect.

Description

technical field [0001] The invention belongs to the field of heating network heating, and relates to a first station of a heating network utilizing waste heat of a coal-fired power plant. Background technique [0002] With the rapid development of urban economic construction and the continuous improvement of people's living standards, the demand for heating load in winter is also growing rapidly. The annual demand for central heating in cities is greater than the actual heating capacity, and the demand for central heating is very urgent. The cold end loss of a thermal power plant is the largest energy loss of the thermal system of the power plant, and a large amount of waste heat of the steam turbine condenser is discharged into the atmosphere through different cooling equipment. When the power plant is operating in winter, the steam turbine exhaust steam condensation heat loss can account for 50-60% of the total fuel calorific value (the thermal power plant is also more tha...

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Problems solved by technology

When the power plant is operating in winter, the steam turbine exhaust steam condensation heat loss can account for 50-60% of the total fuel calorific value (the thermal power plant is also more than 30%), and the steam turbine exhaust steam condensation heat loss is waste heat emission for thermal power plants. But for building heating that requires low-grade heat energy, it constitutes a huge waste of energy and traditional coal-fired power plants, so the existing heating system needs to be transformed, using the high back pressure exhaust steam waste heat recovery technology of the steam turbine and the conventional heating network The first station combined to achieve a heating capacity of 768MW

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